Question: Which state has the oldest Canadian diplomats?
Paraphrase: Where are the oldest Canadian diplomats?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q859563 . ?ent wdt:P2997 ?obj . ?ent wdt:P530 wd:Q16 } ORDER BY DESC(?obj)LIMIT 5 
Answer: Turkey, Uruguay, People's Republic of China, Brazil, Colombia